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Copy Number Variation at the Breakpoint Region of Isochromosome 17Q

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Copy Number Variation at the Breakpoint Region of Isochromosome 17Q Downloaded from genome.cshlp.org on September 29, 2021 - Published by Cold Spring Harbor Laboratory Press Copy number variation at the breakpoint region of isochromosome 17q Claudia M. B. Carvalho1 and James R. Lupski1, 2, 3 1Department of Molecular and Human Genetics. 2Department of Pediatrics, Baylor College of Medicine. 3Texas Children’s Hospital, Houston, Texas, 77030, U.S.A. Running title: CNVs at the breakpoint region of the iso(17q) Key words: CNV, i(17q), NAHR, somatic recombination, meiotic recombination Corresponding Author: James R. Lupski, MD, PhD Cullen Professor and Vice Chairman Department of Molecular and Human Genetics Baylor College of Medicine One Baylor Plaza, Room 604B Houston, TX 77030, USA Phone (713) 798-3723 FAX (713) 798-5073 E-mail: [email protected] 1 Downloaded from genome.cshlp.org on September 29, 2021 - Published by Cold Spring Harbor Laboratory Press ABSTRACT Isochromosome 17q, or i(17q), is one of the most frequent non-random changes occurring in human neoplasia. Most of the i(17q) breakpoints cluster within a ~240 kb interval located in the Smith-Magenis syndrome common deletion region in 17p11.2. The breakpoint cluster region is characterized by a complex architecture with large (~38-49 kb), inverted and directly oriented, low-copy repeats (LCRs), known as REPA and REPB that apparently lead to genomic instability and facilitate somatic genetic rearrangements. Through the analysis of Bacterial Artificial Chromosome (BAC) clones, Pulsed-Field Gel Electrophoresis (PFGE) and public array Comparative Genomic Hybridization (array CGH) data, we show that the REPA/B structure is also susceptible to frequent meiotic rearrangements. It is a highly dynamic genomic region undergoing deletions, inversions and duplications likely produced by Non-Allelic Homologous Recombination (NAHR) mediated by the highly identical SNORD3@, also known as U3, gene cluster present therein. We detected at least seven different REPA/B structures in samples from 29 individuals of which six represented potentially novel structures. Two polymorphic copy- number variation (CNV) variants, detected in 20% of samples, could be structurally described along with the likely underlying molecular mechanism for formation. Our data show the high susceptibility to rearrangements at the i(17q) breakpoint cluster region in the general population and exemplifies how large genomic regions laden with LCRs still represent a technical challenge for both determining specific structure and assaying population variation. The variant REPA/B structures identified may have different 2 Downloaded from genome.cshlp.org on September 29, 2021 - Published by Cold Spring Harbor Laboratory Press susceptibilities for inducing i(17q), thus potentially representing important risk alleles for tumor progression. 3 Downloaded from genome.cshlp.org on September 29, 2021 - Published by Cold Spring Harbor Laboratory Press INTRODUCTION Structural aberrations involving chromosome 17 are frequently observed in human carcinomas. Isochromosome 17q or i(17q), is one of the most frequent non-random genomic alterations ocurring in primitive neuroectodermal tumor/medulloblastoma (50% - Biegel 1997), chronic myeloid leukemia (CML), acute myeloid leukemia (AML), and myelodysplastic syndrome (MDS) (Babicka et al. 2006). According to the Mitelman Database of Chromosome Aberrations in Cancer (http://cgap.nci.nih.gov/Chromosomes/Mitelman), i(17q) can be found in ~2.5% of hematologic malignancies, particularly in CML, in which it can be found in ~12% of cases. In neuroblastomas and hematologic malignancies, amplification of 17q is a significant predictive factor for adverse outcome (Bown et al. 1999). In a prospective clinical trial of patients with AML aged 60 years and above, abnormal 17p and 17q were among the most frequent findings (82%-100%) with complex karyotypes (van der Holt et al. 2006). Remarkably, i(17q) breakpoints frequently cluster in the genome at the short arm of chromosome 17, specifically at the 17p11 region (Fioretos et al. 1999, Scheurlen et al. 1999, Babicka et al. 2006, Mendrzyk et al. 2006). Babicka et al. (2006) showed that the 17p11 is the only region that has been frequently affected in all three hematologic malignancies (AML, CML, MDS), indicating such abnormality as having a pathogenic role during progression and clonal evolution of those diseases. 4 Downloaded from genome.cshlp.org on September 29, 2021 - Published by Cold Spring Harbor Laboratory Press Emerging evidence strongly associates the 17p11 breakpoint predisposition to the 17p11 genomic architectural features. The 17p11, particularly the 17p11.2 sub-band, is a highly genetically unstable region and presents a unique genomic architecture, marked by several dispersed as well as adjacent and both directly oriented and inverted low copy repeats (LCRs). The Smith-Magenis syndrome (SMS; MIM 182290), is caused by a recurrent ~4 Mb deletion generated by Non-Allelic Homologous Recombination (NAHR) that is mediated by two LCRs, the so-called proximal and distal SMS-REPs (Chen et al. 1997; Park et al. 2002). Alternatively, NAHR between the same LCRs can produce a reciprocal duplication, which is the molecular cause of the Potocki-Lupski syndrome (PTLS; MIM 610883) (Potocki et al. 2000; Shaw et al. 2002; Bi et al. 2003; Potocki et al. 2007). Both diseases have been reported also in patients carrying non-recurrent deletions/duplications potentially stimulated by other LCRs in the region (Stankiewicz et al. 2003, Shaw et al. 2004, Potocki et al. 2007). The 17p11.2 region is also frequently subject to other structural variations, including a huge inversion involving the SMS-REP distal and SMS-REP middle (Database of Genomic Variants, DGV, http://projects.tcag.ca/variation/). In 2004, Barbouti et al. structurally characterized an ~240 kb region in 17p11.2 spanning the i(17q) breakpoint cluster region in patients with hematological malignancies CML, AML and MDS. This region is located within the 4 Mb SMS common deletion interval; specifically between the middle and proximal SMS-REPs. It is characterized by a complex architecture with large (~38-49 kb) LCRs, known as REPA and REPB. In the reference genome, two copies of REPA are present in an inverted orientation (REPA1 5 Downloaded from genome.cshlp.org on September 29, 2021 - Published by Cold Spring Harbor Laboratory Press and A2); they share 99.8% identity with each other. REPB is present in three copies, REPB1, B2 and B3, also sharing 99.8% of sequence identity. B1 and B3 copies are in direct orientation, whereas the B2 copy is in an inverted orientation with respect to REPB1, therefore potentially forming a cruciform structure. Five SNORD3@ genes (also known as U3a1, U3a2, U3b1, U3b2, U3b3 or, according to the snoRNABase - http://www-snorna.biotoul.fr/- U3-2, U32b, U3-4, U3, U3-3, respectively) are located in the center of the palindromic structure and at the head portion of each REPA and B repeat. The SNORD3@ cluster include evolutionary conserved motifs (the snoRNABase) and belong to a RNU3 gene family of small nuclear RNAs required for the processing of the pre-18S rRNA (Gao et al. 1997). Based on its complex genomic features, it has been suggested that the REPA/B structure can cause genomic instability and elicit susceptibility to genetic rearrangements (Barbouti et al. 2004; Mendrzyk et al. 2006). The formation of i(17q) appears to result from interchromatid mispairing of the direct repeats, producing a dicentric chromosome and an acentric chromosome which is lost during cell division. Our objective was to systematically investigate the structure of the REPA/B region and determine if it varies within the population. According to the DGV, the REPA/B region is susceptible to frequent meiotic rearrangements, as 36% of all HapMap samples showed copy number polymorphism therein. We performed a detailed statistical analysis of Redon et al. (2006) CGH data on the REPA/B region across the HapMap samples. The results revealed the high frequency of variation existent at the REPA/B loci worldwide. Such numbers, however, do not elucidate how the structure can be genomically 6 Downloaded from genome.cshlp.org on September 29, 2021 - Published by Cold Spring Harbor Laboratory Press organized. Thus, we selected Bacterial Artificial Chromosome (BAC) clones spanning the REPA/B region from the RPC1-11 library. The digestion pattern of each clone was obtained by pulsed-field gel electrophoresis (PFGE) and the REPA/B content was assessed by target-specific probe hybridizations. Empirically determined physical maps were compared to the Human Genome database. Surprisingly, we assembled two BAC- based REPA/B structures, each one with a different total size and REPA/B content. Novel different REPA/B structures could also be assessed after applying the PFGE assay on the analysis of a group of SMS patients, hemizygous for the region, and another group of random samples. Our results suggest that the variation can be far more complex than previously thought, possibly reflecting a wide spectrum of genomic rearrangements therein (inversions, duplications, deletions). Finally, we propose that the mechanism underlying the different REPA/B structures and rearrangements is likely NAHR between the highly similar SNORD3@ gene cluster. 7 Downloaded from genome.cshlp.org on September 29, 2021 - Published by Cold Spring Harbor Laboratory Press RESULTS Statistical analysis of the Database of Genomic Variants: evidence for copy number polymorphism at the REPA/B region across the HapMap
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